With the editor coming out at the end of the month... it will probably stay near the top as the mod community explodes.

Even people that bought it for the console are buying it for the PC... A friend of mine's son built a high end rig and attached it to a 55" TV just for the PC version of Skyrim. Heh.(Obviously he will use it for other games, but he bought the Xbox version of Skyrim, initially)